The trial will be managed by an executive group consisting of researchers from the National Centre for Social Research and the London School of Hygiene and Tropical Medicine which will meet monthly. The Trial Steering Group function will be fulfilled by a committee comprising representatives from each research team, the funders (Department for Education), the providers (Teens and Toddlers) as well as two independent members (Meg Wiggins, Senior Research Fellow, Social Science Research unit, Institute of Education and Sally Hopewell, Senior Research Fellow, Centre for Statistics in Medicine, University of Oxford). This group will meet quarterly to scrutinise trial design and methods and assess data quality. This group will thus including within its function that of a data monitoring committee.